Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Rental	$ 85,629	$ 88,105	$ 175,135	$ 170,801
Rental related services	20,475	24,467	44,986	45,922
Rental operations	106,104	112,572	220,121	216,723
Revenues			47,005	32,724
Total revenues	137,673	127,439	267,126	249,447
Direct costs of rental operations:
Depreciation of rental equipment	21,583	19,726	43,221	38,687
Rental related services	14,894	18,137	33,157	34,500
Other	18,165	21,741	37,618	41,474
Total direct costs of rental operations	54,642	59,604	113,996	114,661
Costs of sales	19,799	7,954	28,242	17,900
Total costs of revenues	74,441	67,558	142,238	132,561
Gross profit	63,232	59,881	124,888	116,886
Selling and administrative expenses	30,540	30,815	62,494	60,510
Income from operations	32,692	29,066	62,394	56,376
Other income (expense):
Interest expense	(2,184)	(3,138)	(4,836)	(6,246)
Foreign currency exchange gain (loss)	117	37	(319)	86
Income before provision for income taxes	30,625	25,965	57,239	50,216
Provision for income taxes	8,076	6,477	14,531	12,279
Net income	$ 22,549	$ 19,488	$ 42,708	$ 37,937
Earnings per share:
Basic	$ 0.93	$ 0.80	$ 1.76	$ 1.57
Diluted	$ 0.92	$ 0.79	$ 1.74	$ 1.54
Shares used in per share calculation:
Basic	24,121	24,246	24,207	24,221
Diluted	24,471	24,579	24,612	24,561
Cash dividends declared per share	$ 0.420	$ 0.375	$ 0.840	$ 0.750
Sales [Member]
Revenues
Revenues	$ 30,669	$ 13,707	$ 45,035	$ 30,532
Other [Member]
Revenues
Revenues	$ 900	$ 1,160	$ 1,970	$ 2,192